Unused parameter

[YukiAttano]

I might be wrong, but in marker_cluster_layer_options.dart the parameter of the class MarkerClusterLayerOptions
padding, maxZoom and inside seem to be unused.

I do also can't get an idea of what they do if they really work.

Edit: I noticed that padding does indeed do something when zoomToBoundsOnClick is set to true.
It would be nice if this could be documented and what padding actually does.